Belgian prosecutors' report supported previous claims made by Edward Snowden that British GCHQ had been intercepting communications at NATO HQ and key European institutions for at least two years.

The operation had a codename "Operation Socialist" and was conducted by the British intelligence service GCHQ, the Guardian reported. Belgian Justice minister, Koen Geens, has confirmed that he received the report from the prosecutors and would discuss it with country's national security council, led by Belgian Prime Minister Charles Michel.